Here is some of the basic information concerning a DW Plug. It is a slip type plug that can be set directly in the tubing without the aid of a landing nipple.

Also attached are images of theD Plug assembly which is attached to comlete the DW Plug assembly, the W running tool which is used to set the device and an R Pulling tool which is used to retrieve the device (The image featured is an RS pulling tool. The correct pulling tool for this application is an RB pulling tool which is the same tool with a longer inner core).

The DW Plug is only good for a 1500psi differential. If this differential is exceeded, the sealing element usually swells and distorts to the point where it is very dificult to retrieve. It is usually necessary to go to a heavier line (.108", .125" or 3/16" Braided line) and the device has to be dragged and beat out of the hole. It is not uncomon for the plug to break at the fishing neck releasing the locking slips which then have to be fished out individually before the rest of the plug can be retrieved.